Basic lens
Included and uncoated by default.
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Higher-index materials can reduce lens thickness compared with standard lenses. The right index depends on your prescription, frame choice and optical requirements.
✓ Our thinner lens packages already include anti-glare and anti-scratch coatings.
| Lens index | Royal Specs option | Good to know |
|---|---|---|
| 1.50 | Standard | Included with complete glasses; basic uncoated option |
| 1.60 | Thin & Light | Higher-index upgrade for suitable prescriptions |
| 1.67 | Extra Thin & Light | Further reduction in thickness where appropriate |
| 1.74 | Ultra Thin & Light | Highest-index package in the current range |
Included and uncoated by default.
Scratch-resistant treatment for standard lenses.
Adds an anti-reflective finish along with scratch resistance.
Every thinner high-index package already includes anti-glare and anti-scratch.
Higher prescription powers can influence thickness more strongly than minor index changes.
Frame size, pupil positioning and lens shape affect the amount of material required.
A higher refractive index may achieve the same power using less material.
Browse prescription glasses or choose reglazing to keep a pair you already own.
Choose your lens use and available upgrades in our 7-step Lens Studio.
Enter or upload your prescription as instructed during checkout.
Our UK optical team prepares your lenses and checks your glasses before dispatch.
Clear answers about this lens type and what to expect when ordering.
Refractive index describes how strongly the lens material bends light. Higher-index materials can often achieve a prescription in a thinner lens.
No. Higher index is not automatically best for every prescription; optical performance, suitability, weight and cost also matter.
For many prescriptions, 1.60 can produce a thinner lens than standard 1.50, although the difference depends on your prescription and frame.
Yes. Royal Specs 1.60, 1.67 and 1.74 lens packages include anti-glare and anti-scratch.
The standard included 1.5 lens package is uncoated. Scratch-resistant and anti-glare options are offered as upgrades.
They can be slimmer, but final weight also depends on material density, prescription and lens size. Less thickness does not always mean less weight.
Compatibility depends on the prescription, lens design and frame. Select the available package during your order.
Not always. Your choice depends on your prescription, frame and preferences. Ask for advice if you are unsure which package suits you.